. Ingegnere meccanico ferroviario. In interruttore ischiuso se la corrente di saldatura è al minimo di 35 ampere o il ma.ximum di 175 ampere. L'equilibrio delcorrente di saldatura viene effettuato con le resistenze di by-pass intorno al solenoide. Questo allestimento può essere fornito come un gruppo dinamometrico, con caratteristiche motore standard, come segue: 110 volt 220volt, CC o 220 440 volt, 60 cicli, bifase o trifase, AC, anche come un gruppo a benzina, oppure può essere fornito con un motore, per essere azionato a cinghia. La velocità normale del generatore è di1,800 r. p. m. Il peso netto di questo nuovo vestito in standardchara

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. Railway mechanical engineer . in switch isclosed whether the welding current is at the minimum of 35amperes or the ma.ximum of 175 amperes. The balance of thewelding current is taken care of in by-pass resistances shuntedaround the solenoid. This outfit can be furnished as a dynamotor unit, withstandard motor characteristics, as follows: 110 volts 220volts, DC or 220 440 volts, 60 cycle, two or three-phase, AC, also as a gasoline-driven unit, or it can be furnished withouta motor, to be belt-driven. The normal generator speed is1, 800 r. p. m. The net weight of this new outfit in standardcharacteristics is 800 lb. with DC motor, 807 lb. with ACmotor, 1, 200 lb. with a gasoline engine, and 550 lb. as abelted outfit without motor. These new d)namotor sets can bemounted on a truck if desired, thus making a portableoutfit. THE FOSDICK HEAVY DUTY UPRIGHTDRILL The Fosdick Machine Tool Company, Cincinnati, Ohio, have added to their line a new design of upright drillingand tapping machine. In general appearance the machine is. Variable Speed Motor Driven Machine with Compound Table Similar to tlie average modern upright drill, but the charac-teristics are entirely different. The gearing arrangements, frictions, feeds, quick return, etc., are similar in detail to 617 618 RAILWAY MECHANICAL ENGINIiER Vol. 93, No. 10 the corresponding parts wliich are being used un Fosdickheavy duty radial drills. The illustrations show the regular constant speed beltdriven machine with round table, and the variable speedmotor driven machine with comjjound table with micrometerdial adjustments and the vertical milling support. Thesehave a capacity of 25 in. diameter of work and the weightis about 2, j50 lb., and they are driven by a 7J/.-hp. constantspeed motor. The Ijase of this machine is surrounded by a channeldraining to a large reservoir for drilling compound, and is sodesigned that bolts may be entered from either end of theT-slots. The table arm has an unusually long bearing on the col-umn

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1910
• booksubjectrailroadengineering